Are there any standards for general tolerances

We are looking for any standards for use with the general tolerance placed in a title block or is this just a subjective area governed by the individual company. (These are tolerances for machined parts)

I have a couple of examples; the first is determined by how many places the dimension uses and the second on the size of the dimension.

If there are standards for these do they also recommend best practices for inch and metric?

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